Scribing instrument.



P. L. CHARBONNIBR.

SCRIBING INSTRUMENT.

APPLICATION FILED JAN. 31, 1914.

1,126,399,A Patented Jan. 26, 1915.

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witnesses.'

THE NURRIS PETERS co. FHOTOYLITHO uumlr/vc roNv D C.

PAUL L. CHARBONNIER, OF BOSTON, MASSACHUSETTS.

SCRIBING INSTRUMENT.

i,iaasee.

Specification of Letters Patent.

Patented Jan. 26, 1915.

Application led January 31, 1914. Serial No. 815,821.

1/ 'o all whom. 'it may concern Be it known that I, PAUL L. CHAMBON- Nmn, a citizen of the French Republic, residing at Boston, in the county of Suffolk and Stateof Massachusetts, have invented new and useful improvements in Scribing lnstruments, of which the following is a. specification.

This invention relates to improvements in scribing instruments and has for its object to provide a strong, compact device by means of which circles and arcs of various radii may be described, during which operation the centering member and the scribing member may at all times be maintained parallel to each other, whereby when a pen is used as the scribing member both points of said pen will engage the surface upon which said circles or arcs are being described irrespective of the diameters or radii thereof.

rThe object of the invention is further to provide means whereby said centering and said scribing members may be moved to predetermined distances apart and clamped in said positions.

The object of the invention is still further to provide ahandle whereby said instrument may be revolved about the centering member, said handle being at all times maintained with its median aXial line parallel with the centering and scribing members.

' T he object of the invention is still further to provide means'adapted tolimit the outward movements of said centering and scribing members relativelyT to each other.

The object of the invention is still 'further to provide an instrument in which the centering and scribing members may be readily detached from the legs thereof and replaced by other members.

The invention consists in the combination and arrangement of parts whereby the above objects and certain other objects hereinafter appearing may be attained, as set forth in the following specification and particularly pointedout in the claims.

Referring to the drawings: Figure 1 is a side elevation, partly in section, of a scribing instrument embodying my invention with the legs of said instrument shown separated a substantial distance apart in full lines, while the dotted lines illustrate other positions of said legs. Fig. 2 is a section partly in elevation of the instrument illustratedV in Fig. 1 and taken on the line 2 2 of said figure. Fig. 3 is a front elevation of the instrument with the legs thereof shown in their closed position. Fig. 4. is a detail sectional view of the head of a modified form of a scribing instrument.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, 5 is a centering member preferably provided with a detachable and reversible needle 6 and 7 is a scribing member,rwhich may have formed or attached at its end any suitable scribing instrument, a pen 8 being shown to better illustrate the advantages of the instrument.

The members 5 and 7 are arranged parallel to each other and means are provided by which said members may at all times be maintained in such relation. The preferred means for accomplishing this feature of the invention preferably consists of a pair of legs 9 and 10 pivotally connected together at their upper ends 11, while at their' lower ends said legs are .pivotally connected at 12 and 13 to the centering member and the scribing member respectively, which pivots are arranged substantially midway of the ends of said members 5 and 7 respectively.

In addition to the legs 9 and 10 a pair of links 14.- and 15 are provided, these links being. pivotally connected together at their upper ends by a pin 16, while the free ends 17 thereof. are slidably connected to the members 5 and 7 respectively. The legs 9 and 10 are preferably bifurcated to receive the links l-l and 15 respectively, which links are pivoted at 18 to the furcations of said legs. It will be obvious in view of the arrangement of said links and their pivots that by moving the members 5 and 7 toward or from each other, the links let and 15 will be rocked upon their pivots 18 and the ends 17 of said links will be moved toward and from the pivots for their respective members, namely 12 and 13, and in a direction parallelV to the median axial lines of said members.

On certain occasions it is desirable to set the centering member and the scribing member at predetermined distances apart, thus serving as a trammel or a beam compass. To accomplish this feature of the invention, the members 5 and 7 are each provided with a slot 19 which extends substantially from the pivots 12 or 13 to the end 20 ofsaid members, while to the ends 17 of each of the links- 14 and 15 is secured a screw 21 which is adapted to enter and substantially fit the slot 19 and to reciprocate longitudinally therein. The screw 21 is screw-threaded at its outer end and adapted to receive a nut 22 which may be rotated on said screw toV bind or clamp the ends 17 at the point desired relatively to the members 5 and 7 the clamping of one ofsaid members suiiicing to secure the legs at therequired distance.

It is often desirable to remove the mem- Y bers 5 and 7 from lthe instrument and reand 13 until freefrom said screws, thus per mitting said members to be removed from said pivots.

A handle 24 .is providedyfor. said instrunient, said handle being pivotally arranged relatively tothe axislcommon to .the legs 9 and 10 of said instrument, this result being preferably accoinplishedby providinga pair of ears 25 and26 at theupperend of one of the legs, preferably the leg 9, said earseach having a center screw 27 arranged therein with thepoints of said screws turned inwardly, one of whiclr is adapted-'to engage a recess 28 in a .portion 29 ofthe-handle 24,y

said portion being cylindrically formed and adapted to conform with the ears 25 and 26, which are of like formation, andthe cylindrical portion 30 of theleg 10,V of said instrument .i which is interposed between the portion 29 of thehandle 24e-andthe ear 25 of theleg 9, The screw 27 mounted insaid ear 25 engages a recess 31 in said member 30.`

Upon the periphery ofthecylindrical por-l tion 29 vof said .handle are formedI stops 32 and 33vadapted to be engaged by like projections 3st `and. 35 formed upon Vthe legs `9 and 10 respectively, said stops being for the purpose of` limiting the outward pivotal movements kof said flegs. Means are. also provided to maintain themedian axial line of said handleparallehwith-said centering and seribing members, which means preferably consists of a rodl 36arranged toslide in said handle. Said rod-has formed at its lower end a disk 374 conforming-in shape to the upper lends .of the linkslll and 15, saiddisk, being arranged between said ends and adapted `to be held in engagement therewith bythe pin-16, which' is slightly upset at its opposite end-to retain the same in place and the links in contact with said disk. The combined thickness of the ends of said links 14 and 15 of said disk are equal to the slots 38 in the legs 9 and 19, which result in said members being bifurcated, said slots being adapted to receive said links when the legs9 and 10 are moved to their closed position, as illustrated in Fig.` 3.

In `Fig. Ll Ihave illustrated a modified form of the instrument in which means are shown for the purpose 'of vadjusting the moving members 5 and --7 toward and from each other, said means alsobeing adapted to maintain said members at the desireddistaneeapart.y T his means consists of a screwthreaded rod 39 havinga disk 40 formed at its lower end betweenhthe links 14- -and 15 and adapted to swivel about the common axis of isaid links, said rod adapted to-slide ina handle 24:1 as in Fig. 1. A recess 41 is arranged. transverselyof said handle within which is `disposed a v.nut 12 having/screwthreaded engagement with said `rod 39 and upon-rotation` thereof causes said rod to be moved longitudinally of said handle to draw the axis of the links '14 and 14C4 toward. the axis ofthe legs 9 and 10.

Having thusdescribed my invention what Iclaiin anddesirebyLetters Patent tosecure is:

1. A vscribing instrument. having, in `combination, a. handle, a pair of legs pivotally attached to said handle, a screw-.threaded rod adapted to slide inf-said handle, a pair of links pivotally connected with'said` rod, said linksbeing also pivoted on. said legs, and anutengaging the threads' onsaid rod and adapted to be operated to move. said rod relatively to said handle.`

.In a scribinginstrument a pair of `legs pivotally `connected together', a pair of links pivotally connected together, saidlinks b eing also pi-voted, upon Saidlegs, a handleA mounted upon the pivot for one of 'said pairs, a.screw-threaded rody mounted-upon the .pivot-for the otheimof said pairs, said rodk adapted to slide insaidv handle, and a nut `mounted. in .said handle -and having screw-threaded engagement with vsaid rod and adapted to be operatedtdmove said pivots toward land away from each other whereby the legs ofA said scribingl instrument may be moved relatively to each other.

3. A scribing instrument having, in combination, aspair of, legs pivotally connected together attheir upper ends, a ycentering member pivotally mounted upon the free end of one of said. legs, al scribing member pivotally mounted upon.` the free .end of the other of said legs, a pai-r of links pivotallyconnected` together` at their upper ends, means to slidably connectthe free ends of one of .said linksto said lcentering member,- and means to slidably Vconnect the freeend of the Otherof saidlinks vto said seribing member, said links also being pivoted subtantially midway of'their lengths to said egs.

t. A scribing instrument having, in combination, a pair of bifurcated legs pivotally connected together at their upper ends, a link pivoted between the furcations of each of said legs, the upper endsof said links being pivotally connected together, a centering member detachably pivoted `upon the free end of one of said legs and slidably attached to the free end of the link pivoted on said leg, a scribing member detachably pivoted upon the free end of the other leg of said instrument and slidably attached to the free end of the link pivoted on said last named leg, and means adapted to clamp said centering and said scribing members to their respective links.

5. A scribing instrument having, in combination, a pair of bifurcated legs pivotally connected together' at their upper ends, a link pivoted between the furcations of each of said legs, the upper ends of said links being pivotally connected together, a centering member detachably pivoted upon the free end of one of said legs and slidably attached to the free end of the link pivoted Aon said leg, a scribing member detachably pivoted upon the free end of the other leg of said instrument and slidably attached to the free end of the link pivoted on said last named leg, a handle arranged to swivel about the common axis for said legs, and a rod mounted to swivel about the common axis for said links, said rod adapted to move in said handle and maintain the median axial line thereof substantially parallel with said centering and said scribing members.

6. A scribing instrument having, in combination, a pair of bifurcated legs pivotally connected together at their upper ends, a link pivoted between the furcations of each of said legs, the upper ends of said links being pivotally connected together, a centering member detachably pivoted upon the free end of one of said legs and slidably attached to the free end of the link pivoted on said leg, a scribing member detachably pivoted upon the free end of the other leg of said instrument and slidably attached to the free end of the link pivoted on said last named leg, a handle arranged to swivel about the common axis 'for said legs, a rod adapted to telescope said handle and maintain the median axial line thereof parallel with said centering and said scribing members, and means on said handle adapted to engage said legs to limit the pivotal movements thereof.

7. A scribing instrument having, in combination, a pair of bifurcated legs pivotally connected together at their upper ends, a link pivoted between the furcations of each of said legs, the upper ends of said links being pivotally connected together, a centering member detachably pivoted upon the free end of one of said legs and slidably attached to the free end of the link pivoted on said leg, a scribing member detachably pivoted upon the free end of the other leg of said instrument and slidably attached to the free end of the link pivot-ed on said last named leg, a handle arranged to swivel about the common axis for said legs, said handle having a recess` arranged transversely thereof, a screw-threaded rod mounted to swivel about the common axis of said links and in telescopic relation to said handle, a nut disposed in said recess having screw-threaded engagement with said rod and adapted to be rotated to move the axis of said links toward and from the axis of said legs, whereby said centering member and said scribing member willbe moved towardand from each other.

8. A scribing instrument having, in combination, a pair of bifurcated legs pivotally connected together at their upper ends, a link pivoted between the furcations of each of said legs, the upper ends of said `links being pivotally connected together, a centering member pivotally connected to the free end of one of said legs at a point substantially midway of the ends of said centering member, said member also having a slot extending substantially from said pivot to one end of said member, means arranged adjacent the free end of the link pivoted upon said last named leg adapted to slidably engage said centering member within said slot, a scribing member pivoted at a point substantially midway of its ends to the free end of the other leg of said instrument, said scribing member also having a slot extending substantially from said pivot to one end of said scribing member, and means ar` ranged adjacent the free end of the link pivoted upon said last named leg adapted to slidably engage said scribing member within said slot.

9. A scribing instrument having, in combination, a pair of bifurcated legs pivotally connected together at their upper ends, a link pivoted between the furcations of each of said legs, the upper ends of said links being pivotally connected together, a centering member detachably pivoted to the free end of one of said legs at a point substantially midway of the ends of said centering member, said centering member also having a slot extending substantially from said pivot to one end of said member, said slot having an opening at one side thereof, a screw arranged adjacent the free end of the link pivoted upon said last named leg, said screw adapted to slidably engage said centering member within said slot and to be disengaged therefrom through said opening, a scribing member detachably pivoted at a point substantially1 midway of its end to the lSO free end of the other leg of said instrument, said scribing member also having a. slot eX- tending substantially from said pvot to one end thereof and provided with an open# v ing at one side of said slot, a. screw. arranged adjacent the free end of the link pivoted upon said last named leg adapted to slidably engage said soribing member Within said slot and be disengaged therefrom 110 through said opening, and means on seid my hand inI presence ofv two 'subscribing Witnesses.

Y PAUL L.V CHARBONNIER.

Witnesses n Y SYDNEY E. TAW,

J. LUDGR VERME.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

i Washington, D. C. 

